The video showed Addlespurger walking by a group of teenagers when one of them abruptly turned and hit him. Addlespurger fell face-first to the concrete and his head struck a curb as the teens walked away.

“I was shocked at the whole narrative of it. There were six kids. There was me walking, just normally on my way, and boom came the punch and down I went, straight down with my face falling and hitting the cool concrete. I was shocked. I was speechless. I didn’t really know what to think,” said Addlespurger.

He showed Clark his injuries, which include two stitches on his lip, a bruise on his face and cuts on his arm.

Addlespurger, who teaches 10th- and 12th-grade English at CAPA, said it’s still tough to breathe because the right side of his body is heavily bruised.

“I look pretty good now compared to how I did look. My face was all puffed up, and I’m thankful that I can walk and talk, and I’m feeling OK, except when I bend over to tie my shoe and the breathing hurts, but I’m hopeful all of that will go away,” said Addlespurger.

He told Clark the surveillance video has been hard to escape at times.

“It pops up everywhere, so my mother has to deal with that, my wife has to deal with that, my daughter has to deal with that, my students have to deal with that, and I feel a responsibility to the community, as a teacher who has been a public servant for 18 years in that capacity, that I need to speak out and say that I’m doing better,” said Addlespurger.

Pittsburgh Mayor Luke Ravenstahl called the attack on Addlespurger “horrific” and “senseless.”

“I watched it just like everybody else did and really couldn’t believe it. You had to rewind it and watch it again, and see if there was some sort of reason that the individual did what he did. It appears there isn’t. There was no real motive," said Ravenstahl.

Police said the suspect's parents brought him to the Zone 2 police station to be interviewed Tuesday. They said the other people in the video will not be charged.

The suspect is a student at a different high school in the city. He is not being identified publicly because he is charged as a juvenile.

"We’re going to do everything we can to come down as hard as we can on this individual to send a message that this activity won’t be tolerated," said Ravenstahl.

Ravenstahl police patrols in the area where the attack occurred will be increased.